There are rumours of a falling-out with the Bos and of a suspicious death.
"We look at any kind of suspicious death on the high seas, " said Wolf, a spokesman for the bureau's Baltimore field office.
The paper says the forensic scientist who investigated his suicide was a junior assistant who had never worked on a suspicious death before.
Most dramatically, rioters fought a pitched battle with police in Shishou, Hubei, province, in late June after the suspicious death of the chef in a hotel with connections to the mayor.
Scientists don't usually test for cyanide in the battery of toxicology tests they may run in a suspicious death and don't generally look for it unless there is a reason to suspect it.
CNN: Lottery winner exhumed; cyanide deaths rare, experts say
Police said they were called to his home in Leeds, but that there was nothing suspicious about his death.
Although officers say there is nothing suspicious about the death of Charlie Booth, they had referred the case to the independent police complaints body.
Police said Mr Gough had no fixed address and they are not treating his death as suspicious.
There are no suspicious circumstances surrounding his death and a report will be sent to the procurator fiscal.
Cumbria Police said her death was suspicious and want to hear from anyone whose "loyalties may have changed".
Police are not treating the death as suspicious, although post-mortem tests proved inconclusive.
Det Insp Les Newman confirmed there were no suspicious circumstances over the death.
Police said on Wednesday they were treating the death as suspicious, but after further investigations had now launched a murder inquiry.
Lothian and Borders Police said there were no suspicious circumstances surrounding his death and a report would be sent to the procurator fiscal.
However, she later criticized the White House treatment of Foster's death as suspicious in a 1994 book proposal reported in the New York Times.
Police said they were not treating Lynsay Jackson's death as suspicious.
There were no suspicious circumstances surrounding his death.
Some mainland internet users are even suspicious over the official death toll of less than 200 people from the earthquake after a hospital in Lushan county reportedly recorded more than 300 deaths, Oriental Daily News notes.
Mr. Browne didn't raise Mr. Heywood's death with Mr. Bo, and wasn't briefed on Mr. Heywood's death either prior to or during his visit, as the British government at the time wasn't treating the death as suspicious, a person familiar with the matter said.
WSJ: U.K. Officials in China Expressed Early Concern About Death
He was later released without charge when officers concluded the death was not suspicious.
BBC: Norwich man William Phillips died 'after row with cyclist'
Cleveland Police said a post-mortem examination found she died of choking and the death was not suspicious.
BBC: Pentland Primary School pupil dies after choking on food
Mr Howard - the cyclist - was arrested 10 days after the incident, but was later released without charge as police concluded the death was not suspicious.
They said Ms Tyler's death "is being treated as murder" and her son's death "non-suspicious".
BBC: Mark Tyler shot mother Maureen before himself, police say
Police have ruled out suspicious activity regarding Reid's death and turned the investigation over to the coroner, CNN affiliate WFMZ reported.
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